'On the Sabbath' in the Bible

And they went into Capernaum; and straightway on the sabbath day he entered into the synagogue, and taught.

And it came to pass, that he went through the corn fields on the sabbath day; and his disciples began, as they went, to pluck the ears of corn.

And the Pharisees said unto him, Behold, why do they on the sabbath day that which is not lawful?

And they watched him, whether he would heal him on the sabbath day; that they might accuse him.

And he saith unto them, Is it lawful to do good on the sabbath days, or to do evil? to save life, or to kill? But they held their peace.